Question

what is the number of electrons with principal quantum number n=3 in Cr atom​

Answer 1

Answer:

hope it helps you . best of luck.

Answer 2

Answer:

13

Explanation:

We have given the atom chromium(Cr).

We have to find the number of electrons with a principal quantum number, n=3

Since the atomic number of chromium is 24 so, its electronic configuration can be written as

Cr[24] = $1s^{2}\ 2s^{2}\ 2p^{6}\ 3s^{2}\ 3p^{6}\ 4s^{1}\ 3d^{5}$

Since, we have to calculate a number of electrons with a principal quantum number,n = 3. So, we will add the total number of electrons in 3rd shell i.e  

2+6+5 = 13. So, the number of electrons with principal quantum number n=3 in Cr atom is 13.